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Problem in receiving email

I have setup the Zimbra Collaboration Suite 3.1 in Fedora3 first time.
When I test email function, I cannot receive any email from outside.

I got this return message:
----------------------------------------------------------------------
This is the Postfix program at host zimbra.permanent.serveftp.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

: Host or domain name not found. Name service
error for name=zimbra.permanent.serveftp.com type=A: Host not found

Final-Recipient: rfc822; testing@permanent.serveftp.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error
for name=zimbra.permanent.serveftp.com type=A: Host not found
-----------------------------------------------------------------------

I have checked all the service is started.
Should I do any other configure for the postfix.